Graphical user interface system for a thermal comfort controller

ABSTRACT

A graphical user interface system for a thermal comfort controller. The user interface system has a central processing unit coupled to a memory and a touch sensitive display unit. The memory stores a temperature schedule data structure and perhaps a temperature history data structure. The temperature schedule data structure is made up of at least one set-point. The temperature history data structure is made up of at least one Actual-Temperature-Point. The display presents the set-points and/or the Actual-Temperature-Points. One representation of the display is a graphical step-function. The user uses a finger or stylus to program the set-points by pointing and dragging a portion of the step-function.

This application is a continuation of U.S. patent application Ser. No. 10/453,027, filed Jun. 3, 2003, entitled “GRAPHICAL USER INTERFACE SYSTEM FOR A THERMAL COMFORT CONTROLLER” which is a continuation of U.S. patent application Ser. No. 09/673,633, filed Oct. 26, 2000, now U.S. Pat. No. 6,509,354, entitled, “GRAPHICAL USER INTERFACE SYSTEM FOR A THERMAL COMFORT CONTROLLER”.

BACKGROUND OF THE INVENTION

The present invention relates to thermostats and other thermal comfort controllers and particularly to a graphical user interface for such thermal comfort controllers.

Current thermal comfort controllers, or thermostats, have a limited user interface which typically includes a number of data input buttons and a small display. Hereinafter, the term thermostat will be used to reference a general comfort control device and is not to be limiting in any way. For example, in addition to traditional thermostats, the present such control device could be a humidistat or used for venting control. As is well known, thermostats often have setback capabilities which involves a programmed temperature schedule. Such a schedule is made up of a series of time-scheduled set-points. Each set-point includes a desired temperature and a desired time. Once programmed with this temperature schedule, the controller sets-up or sets-back the temperature accordingly. For example, a temperature schedule could be programmed so that in the winter months, a house is warmed to 72 degrees automatically at 6:00 a.m. when the family awakes, cools to 60 degrees during the day while the family is at work and at school, re-warms to 72 degrees at 4:00 p.m. and then cools a final time to 60 degrees after 11:00 p.m., while the family is sleeping. Such a schedule of lower temperatures during off-peak hours saves energy costs.

It is well known that users have difficulty using the current form of a user interface for thermostats because such an interface is not intuitive and is somewhat complicated to use. Therefore, users either do not utilize the energy saving programmable functions of the controller, or they do not change the schedule that is programmed by either the installer or that is the factory default setting.

Another limitation of the current user interfaces for thermostats is that once programmed, the temperature schedule cannot be easily reviewed. Usually, the display is configured to show one set-point at a time in a numerical manner. Using the input buttons, the user must ‘page forward’ to the next set-point in the schedule or ‘page backward’ to the previous set-point.

Although the user can, with difficulty, determine the temperature schedule that is programmed into the controller, the user cannot determine how closely this temperature schedule was followed. Of course, when a new set-point determines that the controller should either raise or lower the temperature in a house or other building, the temperature does not immediately change to that new temperature. It can take some time for the room or building to warm up or cool down to the desired temperature. The thermostat typically tracks this information to allow adjustment to be easily made. At present, the user has no way of viewing this information and no way of correlating the temperature schedule with actual house temperatures.

What is needed in the art is a user interface for a thermostat in which the temperature schedule is more easily programmed. The user interface should display a more user friendly representation of the schedule so that the user can review an entire day's schedule all at once. The user interface should also easily display alternative schedules, such as a weekend and weekday schedule. Further, the graphical representation should itself be the intuitive means to programming the schedule. The user interface should also be able to compare the temperature schedule against the actual historical temperature over a period of time.

SUMMARY OF THE INVENTION

This invention can be regarded as a graphical user interface system for thermal comfort controllers. In some embodiments, the user interface system is mounted on the wall as part of a thermostat. In other embodiments, the user interface system is a hand held computing unit which interfaces with a thermostat located elsewhere. The user interface system includes a central processing unit, a memory and a display with a touch-sensitive screen used for input. The memory stores at least one temperature schedule. The temperature schedule has at least one set-point, which associates a desired temperature to a desired time. The display graphically represents the temperature schedule and allows the user to easily and intuitively program the temperature schedule. The temperature schedule may be displayed as a step-function graph, as a listing of set-points, or as a clock and temperature control (such as a dial). In some embodiments, the display can also graphically represent the actual temperature history compared to the desired temperature schedule. In other embodiments, the temperature schedule can be displayed and changed in other graphical ways, such as with slider or scroll bar controls.

Several objects and advantages of the present invention include: the temperature schedule is more easily programmed than in past user interfaces; the step-function or other display is more informative and intuitive; historical data can be displayed to the user; and multiple schedules can be programmed.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a block diagram of a user interface system for a thermal comfort controller.

FIG. 2 is a perspective view of the user interface system in an embodiment with a stylus.

DESCRIPTION OF PREFERRED EMBODIMENTS OF THE INVENTION

The present invention is a user interface system for a thermostat or other comfort controller. Throughout the drawings, an attempt has been made to label corresponding elements with the same reference numbers. The reference numbers include: Reference Number Description 100 Central Processing Unit 200 Display Unit 205 Axis denoting Time 210 Axis denoting Temperature 215 Graphical Representation of Temperature Schedule 220 Graphical Representation of Temperature History 225 Other Data 230 Additional Controls 235 Buttons 240 Stylus 300 Memory 400 Temperature Schedule Data Structure 500 Temperature History Data Structure 600 Set-Point 700 Actual-Temperature-Point 800 Conduits to Heating/Cooling Devices or Thermostat

Referring to the drawings, FIG. 1 is a block diagram of the user interface system for a comfort controller. The user interface system includes a central processing unit 100. This central processing unit 100 is coupled to a display unit 200 and a memory 300. The display unit 200 has a torch-sensitive screen which allows the user to input data without the need for a keyboard or mouse. The memory 300 includes a temperature schedule data structure 400, which is made up of one or more set-points 600. The memory 300 may also include a temperature history data structure 500, which is made up of one or more Actual-Temperature-Points 700.

As previously mentioned, the display unit 200 includes a graphical display/touch sensitive screen. This configuration will provide for very flexible graphical display of information along with a very user friendly data input mechanism. The display unit 200 may be very similar to the touch screen display used in a hand-held personal digital assistant (“PDA”), such as a Palm brand PDA manufactured by 3Com, a Jornada brand PDA manufactured by Hewlett Packard, etc. Of course the graphical user interface system could also be manufactured to be integrated with a thermostat itself. In such an embodiment, a touch-sensitive LCD display is coupled with the thermostat's existing central processing unit and RAM.

The temperature schedule data structure 400 and temperature history data structure 500 are data structures configured and maintained within memory 300. For example, the temperature schedule data structure 400 and temperature history data structure 500 could be simple two-dimensional arrays in which a series of times are associated to corresponding temperatures. In FIG. 1, temperature schedule data structure 400 has been configured to adjust the temperature to 60 degrees at 6:00 a.m. (see 600.1), then to 67 degrees at 6:30 (see 600.2), and up to 73 degrees at 8:00 a.m. (see 600.3) etc. Temperature history data structure 500 is shown to store the information that at 6:00 a.m. the actual temperature was 60 degrees (see 700.1), and by 6:30 a.m., the temperature had risen to 69 degrees (see 700.2).

Of course, the temperature schedule data structure 400 and temperature history data structure 500 could also be more advanced data structures capable of organizing more data. For example, the temperature schedule data structure 400 could be configured to allow more than one schedule to be programmed. One schedule could be assigned to run from Monday through Friday while a second schedule could be assigned to run on Saturdays and Sundays. Alternately, different schedules could be assigned for each day of the week. Different schedules could be devised and stored for the summer months and winter months as well.

Temperature history data structure 500 could be configured to store more information, including historical information over a period of several days, weeks, or months. The data could be aggregated to show the average temperatures by time, day, or season. A person skilled in the art of computer programming could readily devise these data structures.

The user interface system also has conduits 800 to the heating/cooling devices or thermostats thereof so that user interface system can communicate with the thermostat or other comfort controller.

FIG. 2 shows a perspective view of one possible embodiment of the user interface system. In FIG. 2, the user interface system has been installed as an integral element of the thermostat wall unit. The display unit 200 of the user interface system displays the graphical representation of the temperature schedule 215 as well as the graphical representation of the temperature history graph 220. These graphical representations are presented as a graph in which one axis denotes time 205 and the other axis denotes temperatures 210. The graphical representation of the temperature schedule 215 is shown in FIG. 2 as a step function. Other data 225 is also displayed, which could be the current date, day of the week, time, indoor and/or outdoor relative humidity, indoor and/or outdoor temperature, etc. The display unit 200 could also represent the temperature schedule or history schedule in formats other than a function on a graph. For example, the temperature schedule could be shown as a listing of set-points. Or, the graph could be shown as a bar chart in which the length of the bars indicate the temperature.

The display unit 200 can also be configured with additional controls 230, which could, for example, switch the display between Fahrenheit and Celsius for the temperature, between standard and military time, and between showing a single day's schedule versus showing a week's schedule. In addition to the controls programmed and displayed on display unit 200, physical buttons of the thermostat 235 could be programmed to be used for working with the user interface system as well. This is similar to the operation of a PDA.

The graphical representations, controls and other data that are displayed on display unit 200 is accomplished by a computer program stored in memory 300. The computer program could be written in any computer language. Possible computer languages to use include C, Java, and Visual Basic.

The operation of the user interface system is more intuitive than previous user interfaces for other thermal comfort controllers. The various set-points 600 can displayed on the display unit 200 in a graphical format 215, such as in a step-function, bar chart, etc. In the step-function embodiment, which is shown in FIG. 2, each line portion of the step-function line corresponds to a set-point in the temperature schedule data structure 400. Because the display unit 200 is touch-sensitive, the user can use a finger or stylus 240 to “point-and-drag” any one of the vertical lines of the step-function, representing a time of day, to a different value to indicate a new time at which to change the temperature. Similarly, the user can use a finger or stylus 240 to “point-and-drag” any one of the horizontal lines, representing a temperature, to a different value to indicate a new temperature to be maintained by the controller during that time period. When the user changes the graphical representation of the temperature schedule 215, central processing unit 100 modifies the temperature schedule data structure 400 to reflect these changes.

In some embodiments, the buttons 235 or additional controls 230 can be configured so that the user can perform additional programming. For example, one of the buttons 235 or additional controls 230 might cause an alternate schedule to be displayed—such as one for the weekend—which the user can program. Or, pressing one of the buttons 235 or additional controls 230 might cause the temperature history 500 to be displayed by the display unit 200.

In other embodiments of the present invention, the temperature schedule 215 could be displayed in other formats. Again, the step-function shown in FIG. 2 is just one of several ways to graphically display the temperature schedule 215. It could also be shown as a list of set-points, showing the time and temperature for each set-point. Or, a scroll bar or slider bar control could be displayed in which the user simply adjusts the control to adjust the temperature. In such an embodiment, time could be displayed as a digital or analog clock, and the user could modify such a clock control along with the temperature control in order to modify an existing or create a new set-point.

There are many ways in which the user interface system can work with the thermal comfort controller. The user interface system would probably be integrated into a thermal comfort control system and installed on a wall much like current programmable thermostats. However, if the user interface system is configured on a hand-held PDA, the user-interface could communicate with the thermal comfort controller via the PDA's infra-red sensor. Or, the PDA could be synchronized with a personal computer and the personal computer could set the appropriate instructions to the thermal comfort controller. Or, the PDA could use a cellular/mobile phone feature to telephone the controller (i.e., thermostat, personal computer, etc.) to exchange pertinent and relevant data.

From the foregoing detailed description, it will be evident that there are a number of changes, adaptations and modifications of the present invention which come within the province of those skilled in the art. However, it is intended that all such variations not departing from the spirit of the invention be considered as within the scope thereof. 

1. A method for programming a scheduled set point of a programmable thermostat having a touch screen as part of the thermostat, the thermostat adapted to sense a temperature at the location of the thermostat and to control an HVAC system in accordance with the scheduled set point, the scheduled set point having a time value and a corresponding temperature value, the method comprising the steps of: providing a display image on the touch screen, wherein the display image includes one or more touch regions at predefined known locations on the touch screen for use in setting a time value and a corresponding temperature value for the scheduled set point, the time value having one or more associated touch regions at predefined known locations and the temperature value having one or more associated touch regions at predefined different known locations; monitoring the one or more touch regions for touching by a user; changing the time value for the scheduled set point if the monitoring step determines that the one or more touch regions associated with the time value have been touched; and changing the temperature value for the scheduled set point if the monitoring step determines that the one or more touch regions associated with the temperature value have been touched.
 2. The method of claim 1 wherein the temperature value is displayed in a numerical format.
 3. The method of claim 2 wherein the time value is displayed in a numerical format.
 4. The method of claim 1 wherein the time value is displayed in a numerical format.
 5. The method of claim 1 wherein the display image includes one or more first control elements at the predefined known locations of the one or more touch regions that are associated with the time value.
 6. The method of claim 5 wherein at least one of the one or more first control elements includes a scroll bar.
 7. The method of claim 5 wherein at least one of the one or more first control elements includes a slider bar.
 8. The method of claim 5 wherein the display image includes one or more second control elements at the predefined known locations of the one or more touch regions that are associated with the temperature value.
 9. The method of claim 8 wherein at least one of the one or more second control elements includes a scroll bar.
 10. The method of claim 8 wherein at least one of the one or more second control elements includes a slider bar.
 11. The method of claim 1 wherein the display image includes one or more first control elements at the predefined known locations of the one or more touch regions that are associated with the temperature value.
 12. The method of claim 11 wherein at least one of the one or more first control elements includes a scroll bar.
 13. The method of claim 11 wherein at least one of the one or more first control elements includes a slider bar.
 14. A programmable thermostat, comprising: a thermostat having one or more scheduled set points, wherein each of the one or more scheduled set points includes a time value and a corresponding temperature value, the thermostat further having a touch screen as part of the thermostat, and a temperature sensor for sensing the temperature at the location of the thermostat; a memory for storing at least one temperature schedule that includes the one or more scheduled set points; and a controller coupled to the memory, the touch screen and the temperature sensor, the controller adapted accept a signal from the temperature sensor, and control an HVAC system in accordance with the at least one scheduled set points, the controller providing a display image on the touch screen, wherein the display image includes one or more touch regions at predefined known locations on the touch screen for use in setting a time value and a corresponding temperature value for a scheduled set point, the time value having one or more associated touch regions at predefined known locations and the temperature value having one or more associated touch regions at different predefined known locations, the controller further adapted to monitor the one or more touch regions of the touch screen for touching by a user, and changing the time value for the scheduled set point if the controller determines that the one or more touch regions associated with the time value have been touched, and changing the temperature value for the scheduled set point if the controller determines that the one or more touch regions associated with the temperature value have been touched.
 15. The programmable thermostat of claim 14 wherein the temperature value in the display image is in a numerical format.
 16. The programmable thermostat of claim 15 wherein the time value in the display image is in a numerical format.
 17. The programmable thermostat of claim 14 wherein the time value in the display image is in a numerical format.
 18. The programmable thermostat of claim 14 wherein the display image includes one or more first control elements at the predefined known locations of the one or more touch regions that are associated with the time value.
 19. The programmable thermostat of claim 18 wherein at least one of the one or more first control elements includes a scroll bar.
 20. The programmable thermostat of claim 18 wherein at least one of the one or more first control elements includes a slider bar.
 21. The programmable thermostat of claim 18 wherein the display image includes one or more second control elements at the predefined known locations of the one or more touch regions that are associated with the temperature value.
 22. The programmable thermostat of claim 21 wherein at least one of the one or more second control elements includes a scroll bar.
 23. The programmable thermostat of claim 21 wherein at least one of the one or more second control elements includes a slider bar.
 24. The programmable thermostat of claim 14 wherein the display image includes one or more first control elements at the predefined known locations of the one or more touch regions that are associated with the temperature value.
 25. The programmable thermostat of claim 24 wherein at least one of the one or more first control elements includes a scroll bar.
 26. The programmable thermostat according to claim 24 wherein at least one of the one or more first control elements includes a slider bar.
 27. The programmable thermostat of claim 14 wherein the controller is adapted to ensure that the one or more scheduled set points of at least one temperature schedule conform to a step type function.
 28. The programmable thermostat of claim 14 wherein the one or more scheduled set points of at least one temperature schedule are expressed in a temperature schedule data structure stored in said memory.
 29. The programmable thermostat of claim 28 wherein the controller modifies the temperature schedule data structure to include the changed time value and temperature value of the scheduled set point.
 30. A method for displaying a scheduled set point of a programmable thermostat having a touch screen as part of the thermostat, the thermostat adapted to sense a temperature at the location of the thermostat and to control an HVAC system in accordance with the scheduled set point, the scheduled set point having a time value and a corresponding temperature value, the method comprising the steps of: providing a display image on the touch screen, wherein the display image includes one or more touch regions at predefined known locations on the touch screen for use in setting a time value and a corresponding temperature value for the scheduled set point; and the time value having one or more associated touch regions at predefined known locations and the temperature value having one or more associated touch regions at predefined different known locations, wherein the time value and the temperature value are simultaneously displayed in a numerical format at predefined known locations of the display image.
 31. The method of claim 30 wherein the one or more touch regions associated with the time value are displayed adjacent to the predefined known location of the time value, and the one or more touch regions associated with the temperature value are displayed adjacent to the predefined known location of the temperature value in the display image.
 32. The method of claim 30 wherein the temperature value is displayed in a numerical format.
 33. The method of claim 31 wherein the time value is displayed in a numerical format.
 34. The method of claim 30 wherein the time value is displayed in a numerical format.
 35. The method of claim 30 wherein the display image includes one or more first control elements at the predefined known locations of the one or more touch regions that are associated with the time value.
 36. The method of claim 35 wherein at least one of the one or more first control elements includes a scroll bar.
 37. The method of claim 35 wherein at least one of the one or more first control elements includes a slider bar.
 38. The method of claim 35 wherein the display image includes one or more second control elements at the predefined known locations of the one or more touch regions that are associated with the temperature value.
 39. The method of claim 38 wherein at least one of the one or more second control elements includes a scroll bar.
 40. The method of claim 38 wherein at least one of the one or more second control elements includes a slider bar.
 41. The method of claim 30 wherein the display image includes one or more first control elements at the predefined known locations of the one or more touch regions that are associated with the temperature value.
 42. The method of claim 41 wherein at least one of the one or more first control elements includes a scroll bar.
 43. The method of claim 41 wherein at least one of the one or more first control elements includes a slider bar.
 44. A method for displaying at least two temperate schedules of a programmable thermostat, wherein the programmable thermostat includes a touch screen as part of the thermostat, the thermostat adapted to sense a temperature at the location of the thermostat and to control an HVAC system in accordance with the at least two temperature schedules, each of the at least two temperature schedules including at least one scheduled set point having a time value and a corresponding temperature value, the method comprising the steps of: displaying on the touch screen at least part of a first one of the at least two temperate schedules, wherein the first one of the at least two temperate schedules corresponds to two or more days of a week; monitoring one or more predefined known locations on the touch screen for a touch by a user; and displaying on the touch screen at least part of a second one of the at least two temperate schedules when the monitoring step determines that one or more of the predefined known locations has been touched by the user, wherein the second one of the at least two temperate schedules corresponds to two or more days of a week that are different from the two or more days of the first temperate schedule.
 45. The method of claim 44, wherein the two or more days of the first temperature schedule correspond to Monday through Friday.
 46. The method of claim 45, wherein the two or more days of the second temperature schedule correspond to Saturday and Sunday.
 47. A method for operating a programmable thermostat, wherein the programmable thermostat includes a touch screen as part of the thermostat, the thermostat adapted to sense a temperature at the location of the thermostat and to control an HVAC system in accordance with one or more temperature schedule, each of the one or more temperature schedules including at least one scheduled set point having a time value and a corresponding temperature value, the method comprising the steps of: displaying one or more temperature values on the touch screen in a numerical format in units of degrees Fahrenheit; monitoring one or more predefined known locations on the touch screen for a touch by a user; and displaying one or more temperature values on the touch screen in a numerical format in units of degrees Celsius when the monitoring step determines that one or more of the predefined known locations has been touched by the user.
 48. The method of claim 47 further comprising simultaneously displaying a time value and a corresponding temperature value of a scheduled set point on the touch screen, wherein the corresponding temperature value is in a numerical format in units of degrees Fahrenheit.
 49. The method of claim 47 further comprising simultaneously displaying a time value and a corresponding temperature value of a scheduled set point on the touch screen, wherein the corresponding temperature value is in a numerical format in units of degrees Celsius.
 50. A method for operating a programmable thermostat, wherein the programmable thermostat includes a touch screen as part of the thermostat, the thermostat adapted to sense a temperature at the location of the thermostat and to control an HVAC system in accordance with at least one temperature schedules, each of the at least one temperature schedules including at least one scheduled set point having a time value and a corresponding temperature value, the method comprising the steps of: displaying one or more temperature values on the touch screen in a numerical format in units of degrees Celsius; monitoring one or more predefined known locations on the touch screen for a touch by a user; and displaying one or more temperature values on the touch screen in a numerical format in units of degrees Fahrenheit when the monitoring step determines that one or more of the predefined known locations has been touched by the user.
 51. The method of claim 50 further comprising simultaneously displaying a time value and a corresponding temperature value of a scheduled set point on the touch screen, wherein the corresponding temperature value is in a numerical format in units of degrees Fahrenheit.
 52. The method of claim 50 further comprising simultaneously displaying a time value and a corresponding temperature value of a scheduled set point on the touch screen, wherein the corresponding temperature value is in a numerical format in units of degrees Celsius.
 53. A method for programming a scheduled set point of a programmable thermostat having a touch screen as part of the thermostat, the thermostat adapted to sense a temperature at the location of the thermostat and to control an HVAC system in accordance with the scheduled set point, the scheduled set point having a time value and a corresponding temperature value, the method comprising the steps of: providing a display image on the touch screen, wherein the display image includes one or more touch regions at predefined known locations on the touch screen for use in setting a time value and a corresponding temperature value for the scheduled set point, the time value having one or more associated touch regions at predefined known locations and the temperature value having one or more associated touch regions at predefined different known locations; monitoring the one or more touch regions for touching by a user; and on a first touch of the one or more touch regions associated with the time value, changing the time value to a different value; and on a first touch of the one or more touch regions associated with the temperature value, changing the temperature value to a different value.
 54. The method of claim 53, wherein the time value is changed to the different value on the first touch of the one or more touch regions associated with the time value, without requiring the user to first perform a separate touch step to select the time value.
 55. The method of claim 53, wherein the temperature value is changed to the different value on the first touch of the one or more touch regions associated with the temperature value, without requiring the user to first perform a separate touch step to select the temperature value. 